linux-kernel - Re: [PATCH v10 0/4] PCI: dwc: Add ECAM support with iATU configuration

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Message-ID: <175880556056.15879.13833041080045099781.b4-ty@kernel.org>
Date: Thu, 25 Sep 2025 18:36:36 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Jingoo Han <jingoohan1@...il.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Jonathan Chocron <jonnyc@...zon.com>,
	Manivannan Sadhasivam <mani@...nel.org>
Cc: linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: Re: [PATCH v10 0/4] PCI: dwc: Add ECAM support with iATU configuration


On Tue, 23 Sep 2025 16:56:50 +0530, Manivannan Sadhasivam wrote:
> The current implementation requires iATU for every configuration
> space access which increases latency & cpu utilization.
> 
> Designware databook 5.20a, section 3.10.10.3 says about CFG Shift Feature,
> which shifts/maps the BDF (bits [31:16] of the third header DWORD, which
> would be matched against the Base and Limit addresses) of the incoming
> CfgRd0/CfgWr0 down to bits[27:12]of the translated address.
> 
> [...]

Applied to pci/controller/qcom, thanks!

[1/4] PCI: dwc: Add support for ELBI resource mapping
      commit: c96992a24beca0768c1c42ad25d6a466e17ec70f
[2/4] PCI: dwc: Prepare the driver for enabling ECAM mechanism using iATU 'CFG Shift Feature'
      commit: f6fd357f7afbeb34a633e5688a23b9d7eb49d558
[3/4] PCI: qcom: Prepare for the DWC ECAM enablement
      commit: 4660e50cf81800f82eeecf743ad1e3e97ab72190
[4/4] PCI: dwc: Support ECAM mechanism by enabling iATU 'CFG Shift Feature'
      commit: 0da48c5b2fa731b21bc523c82d927399a1e508b0

Best regards,
-- 
Manivannan Sadhasivam <mani@...nel.org>